<!DOCTYPE html>
<link rel="match" href="../expected/change-opacity-ref.html" />
<style>
    #box {
        width: 100px;
        height: 100px;
        background-color: greenyellow;
        opacity: 0;
    }
</style>
<div id="box"></div>
<script>
    document.getElementById("box").style.opacity = "1";
</script>
